國立虎尾科技大學 |

Use of Multibody System Techniques in the Analysis of Railroad Vehicle Stability and Derailment.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Use of Multibody System Techniques in the Analysis of Railroad Vehicle Stability and Derailment./
Author:	O'Shea, James J.
Description:	1 online resource (214 pages)
Notes:	Source: Dissertation Abstracts International, Volume: 78-05(E), Section: B.
Contained By:	Dissertation Abstracts International78-05B(E).
Subject:	Mechanical engineering. -
Online resource:	click for full text (PQDT)
ISBN:	9781369423419

Use of Multibody System Techniques in the Analysis of Railroad Vehicle Stability and Derailment.
O'Shea, James J.

Use of Multibody System Techniques in the Analysis of Railroad Vehicle Stability and Derailment. - 1 online resource (214 pages)

Source: Dissertation Abstracts International, Volume: 78-05(E), Section: B.

Thesis (Ph.D.)

Includes bibliographical references

The forces that govern the dynamics and stability of railroad vehicle systems must be understood in order to prevent derailment. These forces can change significantly based on the position, orientation, and contact configuration of a wheelset with respect to the track. Additionally, these forces can experience large changes in magnitude as the forward velocity of the vehicle increases. In this dissertation, the forces that govern wheelset motion during various derailment scenarios are examined, including gyroscopic, friction, and kinematic contributions. Multiple multibody system derailment models are used to provide the results, including a new fully nonlinear unconstrained multibody system wheel climb derailment model. These models characterize vehicle systems that operate at both high and low velocities, experiencing modes of derailment such as wheel lift and wheel climb. It is shown in this study that a proper investigation of railroad vehicle derailment requires a three-dimensional analysis that does not place simplifying constraints on the motion of the wheelset with respect to the track. The wheelset orientation with respect to the track must be taken into account when determining derailment criteria in kinematic processes, such as wheel climb. To this end, it is shown that derailment criteria, such Nadal's derailment limit, are not conservative in all cases when the wheelset orientation is not taken into account. In the case of model components that are modeled as deformable bodies, the concept of reference conditions is revisited. A distinction is made between the reference conditions, which define the equations to be solved, and substructuring techniques, which allow for efficient model assembly and reduce model dimensionality. It is shown that, when the reference conditions are not applied at a preprocessing stage, substructuring techniques such as the Craig-Bampton method lead to the free modes of deformation. An extended slider-crank model is presented to demonstrate that the free modes cannot be used in all applications, highlighting the importance of the use of reference conditions to obtain an accurate solution.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9781369423419Subjects--Topical Terms:

557493
Mechanical engineering.
Index Terms--Genre/Form:

554714
Electronic books.

Use of Multibody System Techniques in the Analysis of Railroad Vehicle Stability and Derailment.
LDR:03410ntm a2200325Ki 4500 001 909575
005 20180426100014.5
006 m o u
007 cr mn||||a|a||
008 190606s2016 xx obm 000 0 eng d
020 $a 9781369423419
035 $a (MiAaPQ)AAI10300302
035 $a (MiAaPQ)20843
035 $a AAI10300302
040 $a MiAaPQ $b eng $c MiAaPQ
099 $a TUL $f hyy $c available through World Wide Web
100 1 $a O'Shea, James J. $3 1180412
245 1 0 $a Use of Multibody System Techniques in the Analysis of Railroad Vehicle Stability and Derailment.
264 0 $c 2016
300 $a 1 online resource (214 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Dissertation Abstracts International, Volume: 78-05(E), Section: B.
502 $a Thesis (Ph.D.) $c University of Illinois at Chicago $d 2016.
504 $a Includes bibliographical references
520 $a The forces that govern the dynamics and stability of railroad vehicle systems must be understood in order to prevent derailment. These forces can change significantly based on the position, orientation, and contact configuration of a wheelset with respect to the track. Additionally, these forces can experience large changes in magnitude as the forward velocity of the vehicle increases. In this dissertation, the forces that govern wheelset motion during various derailment scenarios are examined, including gyroscopic, friction, and kinematic contributions. Multiple multibody system derailment models are used to provide the results, including a new fully nonlinear unconstrained multibody system wheel climb derailment model. These models characterize vehicle systems that operate at both high and low velocities, experiencing modes of derailment such as wheel lift and wheel climb. It is shown in this study that a proper investigation of railroad vehicle derailment requires a three-dimensional analysis that does not place simplifying constraints on the motion of the wheelset with respect to the track. The wheelset orientation with respect to the track must be taken into account when determining derailment criteria in kinematic processes, such as wheel climb. To this end, it is shown that derailment criteria, such Nadal's derailment limit, are not conservative in all cases when the wheelset orientation is not taken into account. In the case of model components that are modeled as deformable bodies, the concept of reference conditions is revisited. A distinction is made between the reference conditions, which define the equations to be solved, and substructuring techniques, which allow for efficient model assembly and reduce model dimensionality. It is shown that, when the reference conditions are not applied at a preprocessing stage, substructuring techniques such as the Craig-Bampton method lead to the free modes of deformation. An extended slider-crank model is presented to demonstrate that the free modes cannot be used in all applications, highlighting the importance of the use of reference conditions to obtain an accurate solution.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Mechanical engineering. $3 557493
655 7 $a Electronic books. $2 local $3 554714
690 $a 0548
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a University of Illinois at Chicago. $b Mechanical and Industrial Engineering. $3 1180413
773 0 $t Dissertation Abstracts International $g 78-05B(E).
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10300302 $z click for full text (PQDT)